参数资料
| 型号： | MIC5238-1.0YD5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1V .15A TSOT23-5 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1V |
| 输入电压： | 1.5 V ~ 6 V |
| 电压 - 压降（标准）： | 0.31V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC5238-1.0YD5TR MIC5238-1.0YD5TR-ND |
Micrel, Inc.
Dual Supply Mode Efficiency
By utilizing a bias supply the conversion efficiency can be
greatly enhanced. This can be realized as the higher bias
supply will only consume a few μA’s while the input supply
will require a few mA’s. This equates to higher efficiency
saving valuable power in the system. As an example,
consider an output voltage of 1V with an input supply of
2.5V at a load current of 150mA. The input ground current
under these conditions is 2mA, while the bias current is
only 20μA. If we calculate the conversion efficiency using
the single supply approach, it is as follows:
Input power = V IN × output current + V IN × (V BIAS ground
current + V IN ground current)
Input power = 2.5V × 150mA + 2.5 × (0.0002+0.002) =
380.5mW
Output power = 1V × 0.15 = 150mW
Efficiency = 150/380.5 × 100 = 39.4%
MIC5238
Now, using a lower input supply of 1.5V, and powering the
bias voltage only from the 2.5V input, the efficiency is as
follows:
Input power = V IN × output current + V IN × V IN ground
current + V BIAS x V BIAS ground current
Input power = 1.5 × 150mA + 1.5 × 0.002 + 2.5 × 0.0002 =
225mW
Output power = 1V × 150mA = 150mW
Efficiency = 150/225 × 100 = 66.6 %
Therefore, by using the dual supply MIC5238 LDO the
efficiency is nearly doubled over the single supply version.
This is a valuable asset in portable power management
applications equating to longer battery life and less heat
being generated in the application.
This in turn will allow a smaller footprint design and an
extended operating life.
November 2008
10
M9999-111209
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| MIC5239 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Low Quiescent Current 500mA UCap LDO Regulator |
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| MIC5239-1.5BM | 功能描述:IC REG LDO 1.5V .5A 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5239-1.5BM TR | 功能描述:IC REG LDO 1.5V .5A 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5239-1.5BMM | 功能描述:IC REG LDO 1.5V .5A 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
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